I did
Mayer Brown's practice assessment and it said this before practising the VI: “Before you continue, please be aware that there’s no time limit on how long you spend thinking about your response before starting your recording; but, once you do start your recording, you’ll have up to 2 minutes to give your response.” Does that mean the actual VI itself has unlimited prep time? There's no information available on doing the entire immersive assessment under a time limit. At the same time, their email says: "Please note, the only section of the assessment that extra time can be applied to is the preparation time for two of our video interview questions (which are the only part of the assessment where there is a set preparation time)."